NPD - Nitrogen/Phosphorus Detector

  • Very Selective to Nitrogen and Phosphorus
  • Detects down to 100ppb
  • Exceptionally rugged NPD bead
  • Similar in design to the FID
NPD - Nitrogen/Phosphorus Detector
The Nitrogen Phosphorus Detector responds to nitrogen-phosphorus compounds about 100,000 times more strongly than normal hydrocarbons. Due to this high degree of selectivity, the NPD is commonly used to detect pesticides, herbicides, and drugs of abuse.

The SRI ceramic NPD bead is exceptionally rugged and long-lasting, offering service from 100 to 1000 hours, depending on operating conditions.
The is NPD similar in design to the FID, except that the hydrogen flow rate is reduced to about 3mL/minute and an electrically heated thermionic bead (NPD bead) is positioned near the jet orifice. Nitrogen or phosphorus containing molecules exiting the column collide with the hot bead and undergo a catalytic surface chemistry reaction. The resulting ions are attracted to a collector electrode, amplified, and output to the data system.
NPD - Nitrogen/Phosphorus Detector
Product number:
8690-0015 NPD Detector
8690-2615 NPD/DELCD combination detector